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242 lines
12 KiB
XML
242 lines
12 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glVertexAttribPointer">
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<refmeta>
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<refentrytitle>glVertexAttribPointer</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glVertexAttribPointer</refname>
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<refpurpose>define an array of generic vertex attribute data</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glVertexAttribPointer</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLint <parameter>size</parameter></paramdef>
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<paramdef>GLenum <parameter>type</parameter></paramdef>
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<paramdef>GLboolean <parameter>normalized</parameter></paramdef>
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<paramdef>GLsizei <parameter>stride</parameter></paramdef>
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<paramdef>const GLvoid * <parameter>pointer</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>index</parameter></term>
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<listitem>
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<para>Specifies the index of the generic vertex
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attribute to be modified.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>size</parameter></term>
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<listitem>
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<para>Specifies the number of components per
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generic vertex attribute. Must
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be 1, 2, 3, or 4. The initial value is 4.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>type</parameter></term>
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<listitem>
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<para>Specifies the data type of each component in
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the array. Symbolic constants
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<constant>GL_BYTE</constant>,
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<constant>GL_UNSIGNED_BYTE</constant>,
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<constant>GL_SHORT</constant>,
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<constant>GL_UNSIGNED_SHORT</constant>,
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<constant>GL_INT</constant>,
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<constant>GL_UNSIGNED_INT</constant>,
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<constant>GL_FLOAT</constant>, or
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<constant>GL_DOUBLE</constant> are
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accepted. The initial value is <constant>GL_FLOAT</constant>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>normalized</parameter></term>
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<listitem>
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<para>Specifies whether fixed-point data values
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should be normalized (<constant>GL_TRUE</constant>)
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or converted directly as fixed-point values
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(<constant>GL_FALSE</constant>) when they are
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accessed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>stride</parameter></term>
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<listitem>
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<para>Specifies the byte offset between consecutive
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generic vertex attributes. If <parameter>stride</parameter>
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is 0, the generic vertex attributes are
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understood to be tightly packed in the
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array. The initial value is 0.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>pointer</parameter></term>
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<listitem>
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<para>Specifies a pointer to the first component of
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the first generic vertex attribute in the array. The initial value is 0.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para><function>glVertexAttribPointer</function> specifies the
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location and data format of the array of generic vertex attributes at index <parameter>index</parameter>
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to use when rendering. <parameter>size</parameter>
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specifies the number of components per attribute and must be 1,
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2, 3, or 4. <parameter>type</parameter> specifies the data type
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of each component, and <parameter>stride</parameter> specifies
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the byte stride from one attribute to the next, allowing vertices and
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attributes to be packed into a single array or
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stored in separate arrays.
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If set to <constant>GL_TRUE</constant>,
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<parameter>normalized</parameter> indicates that values stored
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in an integer format are to be mapped to the range [-1,1] (for
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signed values) or [0,1] (for unsigned values) when they are
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accessed and converted to floating point. Otherwise, values will
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be converted to floats directly without normalization.</para>
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<para>If a non-zero named buffer object is bound to the <constant>GL_ARRAY_BUFFER</constant> target
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(see <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>) while a generic vertex attribute array is
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specified, <parameter>pointer</parameter> is treated as a byte offset into the buffer object's data store.
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Also, the buffer object binding (<constant>GL_ARRAY_BUFFER_BINDING</constant>) is saved as generic vertex attribute array
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client-side state (<constant>GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING</constant>) for index <parameter>index</parameter>.</para>
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<para>When a generic vertex attribute array is specified,
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<parameter>size</parameter>, <parameter>type</parameter>,
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<parameter>normalized</parameter>,
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<parameter>stride</parameter>, and
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<parameter>pointer</parameter> are saved as client-side
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state, in addition to the current vertex array buffer object binding.</para>
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<para>To enable and disable a generic vertex attribute array,
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call
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<citerefentry><refentrytitle>glEnableVertexAttribArray</refentrytitle></citerefentry>
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and
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<citerefentry><refentrytitle>glDisableVertexAttribArray</refentrytitle></citerefentry>
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with <parameter>index</parameter>. If enabled, the generic
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vertex attribute array is used when
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<citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry>, or
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<citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>
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is called.</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para><function>glVertexAttribPointer</function> is available
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only if the GL version is 2.0 or greater.</para>
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<para>Each generic vertex attribute array is initially disabled
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and isn't accessed when
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<citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry>
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is called.</para>
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<para>Execution of <function>glVertexAttribPointer</function> is
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not allowed between the execution of
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<citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of
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<citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>,
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but an error may or may not be generated. If no error is
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generated, the operation is undefined.</para>
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<para><function>glVertexAttribPointer</function> is typically
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implemented on the client side.</para>
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<para>Generic vertex attribute array parameters are client-side
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state and are therefore not saved or restored by
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<citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry>
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and
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<citerefentry><refentrytitle>glPopAttrib</refentrytitle></citerefentry>.
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Use
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<citerefentry><refentrytitle>glPushClientAttrib</refentrytitle></citerefentry>
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and
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<citerefentry><refentrytitle>glPopClientAttrib</refentrytitle></citerefentry>
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instead.</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para><constant>GL_INVALID_VALUE</constant> is generated if
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<parameter>index</parameter> is greater than or equal to
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<constant>GL_MAX_VERTEX_ATTRIBS</constant>.</para>
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<para><constant>GL_INVALID_VALUE</constant> is generated if
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<parameter>size</parameter> is not 1, 2, 3, or 4.</para>
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<para><constant>GL_INVALID_ENUM</constant> is generated if
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<parameter>type</parameter> is not an accepted value.</para>
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<para><constant>GL_INVALID_VALUE</constant> is generated if
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<parameter>stride</parameter> is negative.</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
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with argument <constant>GL_MAX_VERTEX_ATTRIBS</constant></para>
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<para><citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>
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with arguments <parameter>index</parameter> and <constant>GL_VERTEX_ATTRIB_ARRAY_ENABLED</constant></para>
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<para><citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>
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with arguments <parameter>index</parameter> and <constant>GL_VERTEX_ATTRIB_ARRAY_SIZE</constant></para>
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<para><citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>
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with arguments <parameter>index</parameter> and <constant>GL_VERTEX_ATTRIB_ARRAY_TYPE</constant></para>
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<para><citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>
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with arguments <parameter>index</parameter> and <constant>GL_VERTEX_ATTRIB_ARRAY_NORMALIZED</constant></para>
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<para><citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>
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with arguments <parameter>index</parameter> and <constant>GL_VERTEX_ATTRIB_ARRAY_STRIDE</constant></para>
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<para><citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>
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with arguments <parameter>index</parameter> and <constant>GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING</constant></para>
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<para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
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<constant>GL_ARRAY_BUFFER_BINDING</constant></para>
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<para><citerefentry><refentrytitle>glGetVertexAttribPointerv</refentrytitle></citerefentry>
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with arguments <parameter>index</parameter> and
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<constant>GL_VERTEX_ATTRIB_ARRAY_POINTER</constant></para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para><citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBindAttribLocation</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glColorPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDisableVertexAttribArray</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEnableVertexAttribArray</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEdgeFlagPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glFogCoordPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIndexPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glInterleavedArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glNormalPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPopClientAttrib</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPushClientAttrib</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glSecondaryColorPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexCoordPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glVertexAttrib</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glVertexPointer</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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